Though the key was pressed, nothing ______ on the screen.
A:appeared
B:was appeared
C:appears
D:is appeared
与早期维新派相比,康、梁维新派的特点在于()
2015年4月29日,全国水资源管理工作座谈会在北京召开.
ΔABC中, a = 1, b =3, ∠A=30°,则∠B等于 ( )